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Simplifying 3x + -8 = 3(7) + -8 Reorder the terms: -8 + 3x = 3(7) + -8 Multiply 3 * 7 -8 + 3x = 21 + -8 Combine like terms: 21 + -8 = 13 -8 + 3x = 13 Solving -8 + 3x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 3x = 13 + 8 Combine like terms: -8 + 8 = 0 0 + 3x = 13 + 8 3x = 13 + 8 Combine like terms: 13 + 8 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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